PixArt Imaging Inc.
PAN3401
PS/2 Optical Mouse Single Chip
2. Block Diagram and Operation
LED
DRIVE
POWER ON
RESET
LED
VDD
5V POWER
CMOS IMAGE
SENSOR
VSS
Z1
Z2
WHEEL
BL
DIGITAL
SIGNAL
VOLTAGE
VREF
REFERENCE
BUTTON
BM
BR
PROCESSOR
PS/2
INTERFACE
CLOCK
DATA
INTERNAL
OSC_RES
PS/2 MOUSE CONTROLLER
OSCILLATOR
Figure 3. Block Diagram
The PAN3401 is a CMOS process optical mouse sensor single chip with PS/2 interface that serves as a non-
mechanical motion estimation engine for implementing a computer mouse. It is based on new optical navigation
technology, which measures changes in position by optically acquiring sequential surface images (frames) and
mathematically determining the direction and magnitude of movement. The sensor is in a 12-pin optical package
and comes with the resolution of 400/800/1000 counts per inch (CPI) and the rate of motion up to 28 inches per
second. It is also featured crystal-less (Internal ± 10% accurate oscillator) to save customer’s BOM cost. The
PAN3401 includes PS/2 interface so that no mouse controller is needed to interface through PS/2. The PAN3401
can receive command and echo status or data format which are compatible with IBM® PS/2 mouse and
Microsoft® 3D PS/2 mouse.
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PixArt Imaging Inc.
3
E-mail: fae_service@pixart.com.tw
V1.3, Mar. 2008
PIXART [ PIXART IMAGING INC. ]
